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Mild barlow for use with Leica 20-60x zoom?

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#1 Aquarist

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Posted 26 January 2013 - 08:55 AM

Any recommendations for a mild barlow with the Leica 20-60x zoom? Thanks for any ideas/recommendations.

#2 johnnyha

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Posted 26 January 2013 - 03:25 PM

You can screw the lens element of a Barcon onto the adapter, I dunno about the 20-60X zoom but in the ASPH this yields around 1.5X I believe. Only potential problem is the threads might not match exactly - mine don't.

A GSO barlow element would be a less expensive solution, I imagine it yields similar magnification.

#3 Doug Culbertson

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Posted 26 January 2013 - 03:38 PM

I use the Antares 1.6x barlow, which actually yields around 1.54x or so. I find it to be an excellent barlow, and you can add a 2" extension to get 2x.

#4 Aquarist

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Posted 26 January 2013 - 03:56 PM

You can screw the lens element of a Barcon onto the adapter, I dunno about the 20-60X zoom but in the ASPH this yields around 1.5X I believe. Only potential problem is the threads might not match exactly - mine don't.

A GSO barlow element would be a less expensive solution, I imagine it yields similar magnification.


Actually I have the ASPH. I thought the Astro-Physics Barcon was discontinued and replaced with their 2" Advanced Convertible Barlow. Is that likely to be threaded for the ASPH? 1.5x is really what I would like.

#5 johnnyha

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Posted 26 January 2013 - 05:05 PM

The ASPH is not 20-60X, it's 25-50X.

I have an older Barcon which has 48mm threads but they do not match the pitch of the 48mm threads on my Leica Adapter, I can only screw it in a couple turns. I imagine the new Advanced Barcon would be the same. This is the fault of the APM Leica adapter not the Barcon.

I also have an Antares 1.6X barlow as Doug mentioned and it works really well with the Leica ASPH zoom.

#6 Aquarist

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Posted 26 January 2013 - 05:45 PM

Yes, you are correct, my cutting and pasting was poorly done. I guess I will go with the Antares since that is about what I was looking to obtain.

#7 johnnyha

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Posted 26 January 2013 - 05:54 PM

Good choice. I have found the Antares 1.6X barlow to be an extremely versatile 2" barlow - low profile, inexpensive, and excellent quality - it seems to work well with everything. :cool:

#8 andydj5xp

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Posted 27 January 2013 - 02:55 AM

Yes, you are correct, my cutting and pasting was poorly done. I guess I will go with the Antares since that is about what I was looking to obtain.


Despite the title of this thread Leica ASPH in a slow Newt the discussion mainly deals with different configurations for barlowing the Leica ASPH. In case you haven't seen it have a close look.

Andreas

#9 Aquarist

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Posted 27 January 2013 - 09:05 AM

I have not seen it but will check it out. Thanks!

#10 Aquarist

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Posted 27 January 2013 - 09:53 AM

Excellent information. Thanks Andreas!!!






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